open 2 file in grads

[hossein lotfi]

hi all user
after open tow file in grads I can not display the variables of file2
error:

 ga-> d v2m
Syntax Error:  Invalid Operand
  'v2m' not a variable or function name
  Error ocurred at column 1
DISPLAY error:  Invalid expression
  Expression = v2m
can anyone help me?
thanks .
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